I regret to inform you that this has been broken when the site blew up in November! It's not just challenge caches, you can't see the 2nd page of most searches! The decision was made to not try to mess with it, in favor of updating to the latest opencaching.pl code. Well, as you can tell, that's taking longer than expected, but it **is** being actively worked on by our European helpers.

To see all the challenge caches, I'm afraid the best method is looking at them on our map of caches, as Geo Art in the Gulf of Mexico.